Class: Fluent::Config::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/fluent/config/parser.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(basepath, iterator, fname, i = 0) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/fluent/config/parser.rb', line 30

def initialize(basepath, iterator, fname, i = 0)
  @basepath = basepath
  @iterator = iterator
  @i = i
  @fname = fname
end

Class Method Details

.parse(io, fname, basepath = Dir.pwd) ⇒ Object 



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# File 'lib/fluent/config/parser.rb', line 25

def self.parse(io, fname, basepath = Dir.pwd)
  attrs, elems = Parser.new(basepath, io.each_line, fname).parse!(true)
  Element.new('ROOT', '', attrs, elems)
end

Instance Method Details

#parse!(allow_include, elem_name = nil, attrs = {}, elems = []) ⇒ Object 



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# File 'lib/fluent/config/parser.rb', line 37

def parse!(allow_include, elem_name = nil, attrs = {}, elems = [])
  while line = @iterator.next
    line.force_encoding('UTF-8')
    @i += 1
    line.lstrip!
    line.gsub!(/\s*(?:\#.*)?$/,'')
    if line.empty?
      next
    elsif m = /^\<include\s*(.*)\s*\/\>$/.match(line)
      value = m[1].strip
      process_include(attrs, elems, value, allow_include)
    elsif m = /^\<([a-zA-Z0-9_]+)\s*(.+?)?\>$/.match(line)
      e_name = m[1]
      e_arg = m[2] || ""
      e_attrs, e_elems = parse!(false, e_name)
      elems << Element.new(e_name, e_arg, e_attrs, e_elems)
    elsif line == "</#{elem_name}>"
      break
    elsif m = /^([a-zA-Z0-9_]+)\s*(.*)$/.match(line)
      key = m[1]
      value = m[2]
      if allow_include && key == 'include'
        process_include(attrs, elems, value)
      else
        attrs[key] = value
      end
      next
    else
      raise ConfigParseError, "parse error at #{@fname} line #{@i}"
    end
  end

  return attrs, elems
rescue StopIteration
  return attrs, elems
end

#process_include(attrs, elems, uri, allow_include = true) ⇒ Object 



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# File 'lib/fluent/config/parser.rb', line 74

def process_include(attrs, elems, uri, allow_include = true)
  u = URI.parse(uri)
  if u.scheme == 'file' || u.path == uri  # file path
    path = u.path
    if path[0] != ?/
      pattern = File.expand_path("#{@basepath}/#{path}")
    else
      pattern = path
    end

    Dir.glob(pattern).sort.each { |entry|
      basepath = File.dirname(entry)
      fname = File.basename(entry)
      File.open(entry) { |f|
        Parser.new(basepath, f.each_line, fname).parse!(allow_include, nil, attrs, elems)
      }
    }

  else
    basepath = '/'
    fname = path
    parser_proc = ->(f) {
      Parser.new(basepath, f.each_line, fname).parse!(allow_include, nil, attrs, elems)
    }

    case u.scheme
    when 'http', 'https', 'ftp'
      # URI#open can be able to handle URIs for http, https and ftp.
      require 'open-uri'
      u.open(&parser_proc)
    else
      # TODO: This case should be handled in the previous if condition. Glob is not applied to some Windows path formats.
      # 'c:/path/to/file' will be passed as URI, 'uri' and 'u.path' will be:
      #   - uri is 'c:/path/to/file'
      #   - u.path is '/path/to/file' and u.scheme is 'c'
      # Therefore, the condition of the if statement above is not met and it is handled here.
      File.open(uri, &parser_proc)
    end
  end

rescue SystemCallError => e
  raise ConfigParseError, "include error at #{@fname} line #{@i}: #{e.to_s}"
end